I'm hoping this hasn't been previously covered, or that I'm just not using it correctly to start with, but once I have a saved route, while pinching, squeezing and swiping my screen to move around the chart, I find it desperately frustrating that I keep accidentally touching the route line and dragging a great big diversion into it, necessitating an 'undo' to put it back where t was.

It's NOT locked in Nav mode (ie after pressing "Go Flying") on my iPad and I have encountered same mild frustration at having to select the unwanted waypoint and delete. When does it lock - once moving? Certainly not locked when stationary?

I support the idea of a locked mode.